Fix tree-sitter go to definition from context menus

[Thorium]

Summary

• move the caret to the symbol under the mouse before running context-menu navigation commands
• prefer the tagged definition target when a right-clicked type reference resolves to the current line instead of the earlier type definition
• fix right-click go-to-definition for type annotations

[Copilot]

Pull request overview

This PR improves “Go to definition” behavior when invoked from editor context menus by aligning the caret with the right-clicked symbol and refining tree-sitter definition target selection to avoid resolving back to the clicked reference.

Changes:

• Update merge editor context-menu handling to move the caret to the mouse location before showing the menu.
• Adjust tree-sitter definition resolution to prefer tag-based targets in specific “self-resolving” cases.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
Src/MergeEditView.cpp	Moves caret/selection to the right-clicked text position prior to displaying the context menu.
Externals/crystaledit/editlib/TreeSitterParser.cpp	Refines FindDefinition logic to optionally prefer tag-definition targets over position-based targets in certain cases.

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[sdottaka]

@Thorium

Could you please take a look at the Copilot review and fix any issues if needed?

[sdottaka]

Thank you!